"Input is not a valid dict" when posting to a model with file attribute

[GuillaumeCisco]

Hello I've just detected that we get the error :

"Input is not a valid dict"

when posting with requests.post with a files attribute.
the file attribute will force the request as a multipart formencoded, so the data will be json stringified.

I've created a pull request for handling this behavior.
#20

[vdboor]

Thanks for the PR! As mentioned in #20, do you have an example how to cause this error? For example, a curl command or Django unit test?

[GuillaumeCisco]

Yes I was using a curl command like:
curl -H "Content-Type:multipart/form-data" -F translations="{\"en\": {\"display_name\": \"toto\"}}" -F name="test" -F type="3" -F "file=@./toto;type=application/json" http://my_domain.com/my_ressource/

[crstian]

Hi. This issue still exists - is there any update regarding this error?

[crstian]

What I did to make it work was using json.loads(data) to format the submitted form data. Unfortunately django-parler is checking for isinstance(data, dict) (line 128, here) which returns false on JavaScript objects that where submitted by form data and previous stringified with json.stringify.

Hope this helps someone.

[MehdiDRISSIB]

Really helpful @crstian . I had the same issue and solved quickly with your solution !

[EliasOPrado2]

I have added the change that was done by @GuillaumeCisco but the code doesn't appear to work:
Is there anything I am doing wrong?

    ...
 if isinstance(data, str):
     # try to convert to json
     try:
         data = json.loads(data)
      except:
          self.fail('invalid_json_dump')
    ...

[MehdiDRISSIB]

You should overload TranslatedFieldsField and call the overloaded class in your serializer like this:

import json
from parler_rest.fields import TranslatedFieldsField
from rest_framework import serializers


class TranslatedFieldFixed(TranslatedFieldsField):

    def to_internal_value(self, data):
        """
        Deserialize data from translations fields.
        For each received language, delegate validation logic to
        the translation model serializer.
        """
        if data is None:
            return
        data = json.loads(data)
        if not isinstance(data, dict):
            self.fail('invalid')
        if not self.allow_empty and len(data) == 0:
            self.fail('empty')

        result, errors = {}, {}
        for lang_code, model_fields in data.items():
            serializer = self.serializer_class(data=model_fields)
            if serializer.is_valid():
                result[lang_code] = serializer.validated_data
            else:
                errors[lang_code] = serializer.errors

        if errors:
            raise serializers.ValidationError(errors)
        return result

But It would be best if the error is fixed directly in the library